Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Conode - A simple editor to organize meetings

pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features

Let's Meetup - An easy way to share POIs and addresses in iMessage

Ticket Tribe - Sell tickets online with no fees per ticket

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.